Direct coal liquefaction method

A technology of direct coal liquefaction and coal powder, applied in the field of coal chemical industry, can solve the problems of poor hydrogen supply performance of hydrogen supply solvent, high hydrogen consumption of direct coal liquefaction, low oil yield, etc., achieve strong hydrogen supply capacity and improve coal liquefaction Conversion rate, oil yield, hydrogen consumption reduction effect

Inactive Publication Date: 2019-07-23
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a direct coal liquefaction method to solve the problem of poor hydrogen supply performance of the hydrogen-donating solvent formed by the direct coal liquefaction oil processing in the prior art, which leads to high hydrogen consumption and low oil yield of direct coal liquefaction question

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, tetrahydronaphthalene, dihydrophenanthrene, dihydroanthracene, naphthalene, and decahydronaphthalene are mixed according to a mass ratio of 1:1:1:1:1 as a hydrogen-donating solvent; the dried water content is 0.5-4.0wt %, coal powder with a particle size of ≤0.15mm and a hydrogen-donating solvent are loaded into the autoclave at a mass ratio of 45:55, the initial hydrogen pressure is set to 10Mpa, and the catalyst is Fe 2 o 3 , Fe addition amount is 3.0% of dry coal mass fraction, cocatalyst is sulfur, n(S) / n(Fe)=2.0. After the oil-coal slurry is heated to a reaction temperature of 455°C, the temperature is kept constant for 60 minutes. After the reaction is completed, the temperature of the kettle is lowered to 200°C within 20 minutes.

[0044] Finally, after Soxhlet extraction of the reaction solution obtained above, the n-hexane soluble matter is collected as liquefied oil, and the n-hexane insoluble part is extracted with tetrahydrofuran. Finally, the conversi...

Embodiment 2

[0046] First, tetrahydronaphthalene, dihydrophenanthrene, dihydroanthracene, naphthalene, and decahydronaphthalene are mixed according to a mass ratio of 6:1:1:1:1 as a hydrogen-donating solvent; the dried water content is 0.5-4.0wt %, coal powder with a particle size of ≤0.15mm and a hydrogen-donating solvent are loaded into the autoclave at a mass ratio of 45:55, the initial hydrogen pressure is set to 10Mpa, and the catalyst is Fe 2 o 3 , Fe addition amount is 3.0% of dry coal mass fraction, cocatalyst is sulfur, n(S) / n(Fe)=2.0. After the oil-coal slurry is heated to a reaction temperature of 455°C, the temperature is kept constant for 60 minutes. After the reaction is completed, the temperature of the kettle is lowered to 200°C within 20 minutes.

[0047] Finally, after Soxhlet extraction of the reaction solution obtained above, the n-hexane soluble matter is collected as liquefied oil, and the n-hexane insoluble part is extracted with tetrahydrofuran. Finally, the conver...

Embodiment 3

[0049] First, tetrahydronaphthalene, dihydrophenanthrene, dihydroanthracene, naphthalene, and decahydronaphthalene are mixed according to a mass ratio of 1:6:1:1:1 as a hydrogen-donating solvent; the dried water content of 0.5-4.0wt %, coal powder with a particle size of ≤0.15mm and a hydrogen-donating solvent are loaded into the autoclave at a mass ratio of 45:55, the initial hydrogen pressure is set to 10Mpa, and the catalyst is Fe 2 o 3 , Fe addition amount is 3.0% of dry coal mass fraction, cocatalyst is sulfur, n(S) / n(Fe)=2.0. After the oil-coal slurry is heated to a reaction temperature of 455°C, the temperature is kept constant for 60 minutes. After the reaction is completed, the temperature of the kettle is lowered to 200°C within 20 minutes.

[0050] Finally, after Soxhlet extraction of the reaction solution obtained above, the n-hexane soluble matter is collected as liquefied oil, and the n-hexane insoluble part is extracted with tetrahydrofuran. Finally, the conver...

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Abstract

The invention provides a direct coal liquefaction method. The method comprises the following steps: S1, enabling tetrahydronaphthalene, dihydrophenanthrene, dihydroanthracene, naphthalene and decalinto be mixed to form a hydrogen-supplying solvent; S2, enabling pulverized coal and the hydrogen-supplying solvent to be filled into an autoclave to form coal-oil slurry, and enabling the coal-oil slurry to be subjected to direct coal liquefaction reaction to obtain a reaction solution; and S3, collecting n-hexane soluble matter, which is a liquefied oil product, in the reaction solution. In the direct coal liquefaction method provided by the invention, a solution formed by mixing the tetrahydronaphthalene, the dihydrophenanthrene, the dihydroanthracene, the naphthalene and the decalin is adopted as the hydrogen-supplying solvent. The hydrogen-supplying solvent has a very strong hydrogen-supplying capacity, can effectively reduce hydrogen consumption in the process of direct coal liquefaction, and can remarkably improve the coal liquefaction conversion rate and oil yield, finally, the coal liquefaction conversion rate can be as high as 88% or more, the oil yield can be up to 63-68%, andthe hydrogen consumption is 5% or less.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a coal direct liquefaction method. Background technique [0002] Coal liquefaction is a chemical technology that uses coal as raw material to produce liquid fuel. Coal direct liquefaction is under high temperature and high pressure and a catalyst, the C-C bonds of coal molecules are broken to generate free radical fragments. 2 And the process of generating clean liquid fuel and other chemical products under the action of circulating hydrogen-donating solvent to donate hydrogen. In the actual operation of the small-scale continuous test unit (BSU), the process development unit (PDU) and the million-ton Shenhua coal direct liquefaction demonstration unit (DP), the solvent with good hydrogen supply performance not only directly affects the conversion rate of coal and oil recovery. It is also beneficial to the preparation, transportation and fluidity of coal slurry in the heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/06
CPCC10G1/065
Inventor 王薇舒歌平王洪学高山松
Owner CHNA ENERGY INVESTMENT CORP LTD
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